Reverse Information.mp3 from this site : https://mp3cut.net/reverse-audio
Now listen reversed audio and you will get some clue

Listen second audio: Message.wav
This sounds like morse code
You will get decoded text by uploading this file (Message.wav) into https://morsecode.world/international/decoder/audio-decoder-adaptive.html

Decoded text from morse code:
7U2QU01535011741230F4242841J4N

### flag:
UCTF{7U2QU01535011741230F4242841J4N}